Slide clasp fastener



A. BOENECKE SLIDE CLASP FASTENER' March 6, 1945.

Original Filed Feb. 6, 1939 five/27 0 3 Patented Mar. 6, 1945 2.310.013suns cmsr' rss'rnnna Alfred Boenecke, Berlln-sehoneberg, Germany;

vested in the Alien Property Custodian Original application February 6,1939, Serial No.

254,985. Divided and this application April 2,

1940, Serial No. 327,513. In Germany February 3 Claims;

The present invention relates to slide fasteners and particularly to theshape of a strip of flexible material from which slide claspfastenerelements may be formed integral with the stringers forsuch'fastener elements. This application is a division of my copendingapplication Serial No.

' 254,965, filed February 6, 1939, which eventuated in U. 8. Patent2,262,881, Nov. 18, 1941.

A slide clasp fastener of the usual type includes two stringers composedof fabric and the fastener elements which are separately secured to theI stringers and the slide fastener elements usually consist of metal orother similar materials. In the production of slide clasp fasteners ofthisty'pe it is necessary to attach the fastener elements to thestringers and apparatus has been provided to, apply the metallicfastener elements in one continuous operadon.

An object of the present invention is to provide a strip of flexiblematerial from which the fastener elements together with the stringersmay be simultaneously formed.

Other and further-features and objects oi the invention will be apparentfrom a consideration of the accompanying drawing and the followingdescription wherein an exemplary embodiment of the invention isdisclosed.

In the drawing:

his. 1 is a perspective view of a strip of fiexihle material from whichthe fastener elements and stringers may he formed.

Fig. 2 is a plan view of the strip shown in Fig.1 illustrating themanner in which the festenerele ments are formed irom parts of thestrip.

Figure 2A is an isometric view oi a portion of one of the fastenermembers after separating the same in the manner shown in 2.

Fig. 3 is a plan view partly in section illustrating the manner in whichthe fastener elements may be interlocked.

Referring to the drawing there is shown in Fig. l a strip ofilexiblematerial shaped in such a manner as to provide the requisitecharacteristics to the finished fastener elements and the stringers. Theparts of the strip shown in Fig. 1 at I are designed to provide thestringers for the fastener elements. The strip further includes hollowbeads or enlargements 2 each of which is provided with a longitudinalpassage 8 as shown in Fig. 1. The hollow enlarged portions 2 are spacedwith respect to each other so as to leave between these heads a stripportion 4 having a slightly greater thickness than the stringer portlonsl of the strip. The central portion 4 how ever is not as thick as thebead portions 2.

The strip from which'the fastener elements is produced may be formed ofany suitable material such as synthetic resins, ebonite or suitablyprepared rubber compounds or the like.

The strip may be preformed of any suitable flexible material for exampleby extrusion in dimensions and shape so as to provide the desired shapeand appearance to the finished fastener elements. 1

The two cooperating parts of the 'slide fastener or the two appertainingseries of fastener elements are produced simultaneously with thestringers from the strip shown in Fig. 1. The strip is initially of adouble width and the two cooperating parts of the fastener aresimultaneously formed from thestrip which is thereafter severed alongthe groove 5 to form the two appertaining parts of the fastener.

In producing the fastener elements the stri shown in Fig. 1 isfirst'gprovided with a plurality of openings or perforations d as shownin Fig. 2. These openings are formed in the central portion d of thestrip and extend into the beads or hollow enlargements 2. After thestrip has been thus perforated at spaced intervals the strip isseparated along the groove 5 in any well known manner such as by meansof a rotating knife it.

In this manner the primary parts of the finished fastener are produced.The two stringers l have simultaneously formed therein two series offastener elements 3 and associated head projections is between whichrecesses t are provided. (Fig. 2A.) Thus the transverse websintermediate the opening 6 provide the fastener elements l and oneseries of the elements i can be made to engage the recessesil of theother series. To

eliminate the possibility of sharp. edges on the elements 7 the groove 5in the central portion d is suitably rounded ofi along the edgesthereof.

Thereafter the two stringers i having the fas- -tener elements 1 formedfrom integral parts thereof. a strip thereof may be interlocked as shownin Fig. 3 by means of a conventional type clasp it. In other words thetransverse webs which form the fastener elements I of one stringer aredisplaced so as to move within therecesses 8 of the other stringer andto interlock the two parts of the fastener elements.

I claim:

1. A flexible slide clasp fastener strip comprising, .-a marginalportion constituting astringer of the fhtener, a hollow bead integralwith the marginal portion and extending longitudinally and extendinglongitudinally thereof, said hollow portion integral with the bead headand said strip portion having recesses therein uniformly spacedtherealong and adapted to receive fastener elements therein, andportions of said hollow beads and said strip intermediate said recessesproviding fastener elements integral with the stringer.

2. A slide clasp fastener comprising a pair of fiat flexible stringers,each of said stringers havof the associated stringer, the set of beadpro-- jections of one stringer being constructed and arranged tointermesh with the projections on the other stringer while the flatfastener elements of the first stringer extend into the bead hollow ofthe latter stringer and releasably engage respectively the innerportions of said other bead proiections. I

3. In a fastener device, the combination of a pair of unitary flexiblemembers, each of said members comprising a longitudinally extendinghollow bead having a set of spaced transverse notches thereinintersecting the bead hollow thereby forming a set of intermediate beadprojections between the notches, flat fastener elements projectingrespectively from said projections and lying substantially in a commonplane, said elements being formed of the same material as the head, theset of bead projections of one of said members being constructed andarranged to inter-mesh with the projections of the other member whilethe flat fastener elements of the first member extend into the beadhollow of the latter member and releasably engage respectively the innerportions of said other bead projections.

.ALFRED BOENECKE.

